Apple discovers issue with MacBook batteries, offers solutions

Apple said Friday it has discovered that some batteries used in its MacBook and MacBook Pro notebooks may have performance issues and is offering a software update that is designed to improve performance.

The 244KB Battery Updater will check to see if a battery needs to be updated on startup, wake from sleep, and when a battery is inserted.

"If in these cases there is no AC power supplied, it will then wait until AC power is present and then check to see if the battery needs to be updated," Apple said. "If the battery needs to be updated it will update it automatically. Wait 30 seconds before you validate the installation."